Other real estate owned related expenses in the statements of income.

No definition available.

Name:	hmta_OtherRealEstateOwned
Namespace Prefix:	hmta_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of net gain on the sale of other real estate owned during the period. Excludes write downs.

+ References

No definition available.

+ Details

Name:	hmta_OtherRealEstateOwnedNetGainOnSales
Namespace Prefix:	hmta_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of expense recognized during the period for the foreclosure on real estate assets.

+ References

No definition available.

+ Details

Name:	us-gaap_ForeclosedRealEstateExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule III

-Article 5

+ Details

Name:	us-gaap_RealEstateAcquiredThroughForeclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_RealEstatePropertiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=hmta_CommercialBuildingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=hmta_CommercialLotsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=hmta_ResidentialDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=hmta_ResidentialLotsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 5 - Foreclosed Properties (Details) - Classification of Other Real Estate Owned and Expenses (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Real Estate Properties [Line Items]
Other Real Estate Owned	$ 6,917	$ 7,175	$ 6,986	$ 8,143
Net gain on sales		(5)hmta_OtherRealEstateOwnedNetGainOnSales
Operating expenses	30us-gaap_ForeclosedRealEstateExpense	64us-gaap_ForeclosedRealEstateExpense
Total Other Real Estate Owned	30hmta_OtherRealEstateOwned	59hmta_OtherRealEstateOwned
Residential Lots [Member]
Real Estate Properties [Line Items]
Other Real Estate Owned	2,954		3,023
Residential Development [Member]
Real Estate Properties [Line Items]
Other Real Estate Owned	423		423
Commercial Lots [Member]
Real Estate Properties [Line Items]
Other Real Estate Owned	1,076		1,076
Commercial Buildings [Member]
Real Estate Properties [Line Items]
Other Real Estate Owned	$ 2,464		$ 2,464